Redo networking (#22)

* Rewriting network functions

* Add buffer to dup
Fix non-blocking handling by triggering once on enabling events to read to EOF

* Modifications for UDP API

* Implement TCP client side

* Add active close

* Add DMAR parser

* Implement basic TCP listening. Need to improve the state machine

* Reduce debugging

* Fixes for close procedure

* Updates to fix path processing in libstd

arch/x86_64/src/acpi/dmar.rs

@@ -0,0 +1,170 @@
+use core::mem;
+
+use super::sdt::Sdt;
+
+/// The DMA Remapping Table
+#[derive(Debug)]
+pub struct Dmar {
+    sdt: &'static Sdt,
+    pub addr_width: u8,
+    pub flags: u8,
+    _rsv: [u8; 10],
+}
+
+impl Dmar {
+    pub fn new(sdt: &'static Sdt) -> Option<Dmar> {
+        if &sdt.signature == b"DMAR" && sdt.data_len() >= 12 { //Not valid if no local address and flags
+            let addr_width = unsafe { *(sdt.data_address() as *const u8) };
+            let flags = unsafe { *(sdt.data_address() as *const u8).offset(1) };
+            let rsv: [u8; 10] = unsafe { *((sdt.data_address() as *const u8).offset(2) as *const [u8; 10]) };
+
+            Some(Dmar {
+                sdt: sdt,
+                addr_width: addr_width,
+                flags: flags,
+                _rsv: rsv,
+            })
+        } else {
+            None
+        }
+    }
+
+    pub fn iter(&self) -> DmarIter {
+        DmarIter {
+            sdt: self.sdt,
+            i: 12 // Skip address width and flags
+        }
+    }
+}
+
+///
+
+/// DMAR DMA Remapping Hardware Unit Definition
+// TODO: Implement iterator on DmarDrhd scope
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarDrhd {
+    kind: u16,
+    length: u16,
+    flags: u8,
+    _rsv: u8,
+    segment: u16,
+    base: u64,
+}
+
+/// DMAR Reserved Memory Region Reporting
+// TODO: Implement iterator on DmarRmrr scope
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarRmrr {
+    kind: u16,
+    length: u16,
+    _rsv: u16,
+    segment: u16,
+    base: u64,
+    limit: u64,
+}
+
+/// DMAR Root Port ATS Capability Reporting
+// TODO: Implement iterator on DmarAtsr scope
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarAtsr {
+    kind: u16,
+    length: u16,
+    flags: u8,
+    _rsv: u8,
+    segment: u16,
+}
+
+/// DMAR Remapping Hardware Static Affinity
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarRhsa {
+    kind: u16,
+    length: u16,
+    _rsv: u32,
+    base: u64,
+    domain: u32,
+}
+
+/// DMAR ACPI Name-space Device Declaration
+// TODO: Implement iterator on DmarAndd object name
+#[derive(Debug)]
+#[repr(packed)]
+pub struct DmarAndd {
+    kind: u16,
+    length: u16,
+    _rsv: [u8; 3],
+    acpi_dev: u8,
+}
+
+/// DMAR Entries
+#[derive(Debug)]
+pub enum DmarEntry {
+    Drhd(&'static DmarDrhd),
+    InvalidDrhd(usize),
+    Rmrr(&'static DmarRmrr),
+    InvalidRmrr(usize),
+    Atsr(&'static DmarAtsr),
+    InvalidAtsr(usize),
+    Rhsa(&'static DmarRhsa),
+    InvalidRhsa(usize),
+    Andd(&'static DmarAndd),
+    InvalidAndd(usize),
+    Unknown(u16)
+}
+
+pub struct DmarIter {
+    sdt: &'static Sdt,
+    i: usize
+}
+
+impl Iterator for DmarIter {
+    type Item = DmarEntry;
+    fn next(&mut self) -> Option<Self::Item> {
+        if self.i + 4 <= self.sdt.data_len() {
+            let entry_type = unsafe { *((self.sdt.data_address() as *const u8).offset(self.i as isize) as *const u16) };
+            let entry_len = unsafe { *((self.sdt.data_address() as *const u8).offset(self.i as isize + 2) as *const u16) } as usize;
+
+            if self.i + entry_len <= self.sdt.data_len() {
+                let item = match entry_type {
+                    0 => if entry_len >= mem::size_of::<DmarDrhd>() {
+                        DmarEntry::Drhd(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarDrhd) })
+                    } else {
+                        DmarEntry::InvalidDrhd(entry_len)
+                    },
+                    1 => if entry_len >= mem::size_of::<DmarRmrr>() {
+                        DmarEntry::Rmrr(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarRmrr) })
+                    } else {
+                        DmarEntry::InvalidRmrr(entry_len)
+                    },
+                    2 => if entry_len >= mem::size_of::<DmarAtsr>() {
+                        DmarEntry::Atsr(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarAtsr) })
+                    } else {
+                        DmarEntry::InvalidAtsr(entry_len)
+                    },
+                    3 => if entry_len == mem::size_of::<DmarRhsa>() {
+                        DmarEntry::Rhsa(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarRhsa) })
+                    } else {
+                        DmarEntry::InvalidRhsa(entry_len)
+                    },
+                    4 => if entry_len >= mem::size_of::<DmarAndd>() {
+                        DmarEntry::Andd(unsafe { &*((self.sdt.data_address() + self.i) as *const DmarAndd) })
+                    } else {
+                        DmarEntry::InvalidAndd(entry_len)
+                    },
+                    _ => DmarEntry::Unknown(entry_type)
+                };
+
+                self.i += entry_len;
+
+                Some(item)
+            } else {
+                None
+            }
+        } else {
+            None
+        }
+    }
+}

arch/x86_64/src/acpi/mod.rs

@@ -9,12 +9,14 @@ use memory::{allocate_frames, Frame};
 use paging::{entry, ActivePageTable, Page, PhysicalAddress, VirtualAddress};
 use start::{kstart_ap, CPU_COUNT, AP_READY};
 
+use self::dmar::Dmar;
 use self::local_apic::LocalApic;
 use self::madt::{Madt, MadtEntry};
 use self::rsdt::Rsdt;
 use self::sdt::Sdt;
 use self::xsdt::Xsdt;
 
+pub mod dmar;
 pub mod local_apic;
 pub mod madt;
 pub mod rsdt;
@@ -133,6 +135,12 @@ pub fn init_sdt(sdt: &'static Sdt, active_table: &mut ActivePageTable) {
         // Unmap trampoline
         active_table.unmap(trampoline_page);
         active_table.flush(trampoline_page);
+    } else if let Some(dmar) = Dmar::new(sdt) {
+        println!(": {}: {}", dmar.addr_width, dmar.flags);
+
+        for dmar_entry in dmar.iter() {
+            println!("      {:?}", dmar_entry);
+        }
     } else {
         println!(": Unknown");
     }